I used diluted piping gel (1/2 vodka, 1/2 piping gel) and applied with a very wide paint brush. It took a while to dry but worked fine. Didn't have time to buy anything else. Also did a test with diluted black gel food coloring, which gave a nice shine too but seemed gross to me to add more food coloring to something already saturated with color (since it was going on top of black fondant).
5/17/14 at 4:48pm